67874-68-4Relevant articles and documents
A convenient synthesis of (E)-4-alkoxy-2-amino-3-butenoic acid derivatives
Kobayashi, Kazuhiro,Irisawa, Susumu,Akamatsu, Hideki,Takahashi, Masaki,Kitamura, Taichi,Tanmatsu, Miyuki,Morikawa, Osamu,Konishi, Hisatoshi
, p. 2307 - 2313 (2007/10/03)
(E)-4-Alkoxy-2-formylamino-3-butenoic acid esters have been prepared in two steps from 3-alkoxy-1-isocyanopropenes. The method is based on the reaction of 3-alkoxy-1-isocyano-1-lithiopropenes, which can be generated by the treatment of 3-alkoxy-1-isocyanopropenes with LDA in THF at -78 °C, with alkyl chlorocarbonates, affording 4-alkoxy-2-isocyano-3-butenoates. These isocyano esters have been easily transformed into the corresponding formylamino esters by treating with concd HCl in Et2O at - 20 °C. Subsequently, the introduction of a substituent into the 2-position has been achieved by ethoxycarbonylation with ethyl chlorocarbonate, followed by alkylation with alkyl halides by using hexamethylphosphoric triamide (HMPA) as a co-solvent. The resulting alkylated isocyano 3-butenoates have been similarly hydrolyzed with concd HCl to the corresponding 2-formylamino-3- butenoates.
Ozonolysis of Olefins VIII [1]. Synthesis of Phenoxyacetaldehydes by Ozonolysis of Allylphenylethers
Jellen,Mittelbach,Junek
, p. 167 - 172 (2007/10/03)
A new route for the preparation of a series of phenoxyacetaldehydes (2a-j) which are useful intermediates or products, is described. It starts from the easily available allylphenylethers 1a-j which are ozonized at -40°C and further treated with dimethylsulfide to give solutions of the corresponding phenoxyacetaldehydes 2a-j; these are purified by column chromatography. Reaction of 2a-j with 1-methyl-1-phenylhydrazine leads to the corresponding hydrazones 3a-c, 3e-g, 3i, and 3j. The aldehydes can also be transformed into the stable dimethylcetals 4a, 4e, 4h, and 4i by reaction with trimethyl orthoformate.
Secondary amines and use in pharmaceutical compositions
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, (2008/06/13)
A compound of formula (I): STR1 or a pharmaceutically acceptable salt, ester or amide thereof, in which: W is an optionally substituted phenyl group of the formula STR2 wherein R1 is hydrogen or fluorine, R2 is hydrogen, C1-6 alkyl, halogen or trifluoromethyl; or W is a phenoxymethyl or benzofuran-2-yl group; R3 is C1-12 alkyl or phenyl C1-6 alkyl; A is hydrogen or methyl, X is carboxy, --Z--CO2 H, --Z--OH, T--Z--CO2 H, --Z--NR4 R5, --T--Y--OM, --T--Y--NR4 R5, or --T--R6, in the para- or meta-position with respect to the --(CH2)n group, wherein R4 and R5 are each hydrogen or C1-6 alkyl, R6 is C1-6 alkyl, T is 0, S, --NH or --N--R7, in which R7 is C1-6 alkyl Z is C1-10 straight or branched alkylene optionally containing a carbon-carbon double bond; Y is C2-10 straight or branched alkylene, provided that the hetero atoms in --T--Y--OM and --T--Y--NR4 R5 are separated by at least two carbon atoms, M is hydrogen, C1-6 alkyl or phenyl, and n is 1 or 2, is useful for obesity or hyperglycaemia.